Add docs

src/app.rs

@@ -49,17 +49,22 @@ pub struct CliOpts {
     #[structopt(flatten)]
     pub boilerplate: BoilerplateOpts,
 
+    /// Subcommands
     #[structopt(subcommand)]
     cmd: Command,
 }
 
+/// Subcommands
 #[derive(StructOpt, Debug)]
 pub enum Command {
     /// Add a line to the gitignore
     Add {
+        /// The glob string that should be added
         glob: String,
     },
+    /// Download a gitignore for a language
     Get {
+        /// The language for which the gitignore should be downloaded
         lang: String,
     },
 }